Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV | |
LEPS Collaboration | |
刊名 | PHYSICAL REVIEW C |
2018 | |
卷号 | 97期号:1页码:15205 |
ISSN号 | 2469-9985 |
DOI | 10.1103/PhysRevC.97.015205 |
文献子类 | Article |
英文摘要 | Differential cross sections and photon-beam asymmetries for the (gamma) over right arrowp -> pi(+) n reaction have been measured for 0.6 < cos theta(pi) < 1 and E-gamma = 1.5-2.95 GeV at SPring-8/LEPS. The cross sections monotonically decrease as the photon beam energy increases for 0.6 < cos theta(pi) < 0.9. However, the energy dependence of the cross sections for 0.9 < cos theta(pi) < 1 and E-gamma = 1.5-2.2 GeV (W = 1.9-2.2 GeV) is different, which may be due to a nucleon or Delta resonance. The present cross sections agree well with the previous cross sections measured by other groups and show forward peaking, suggesting significant t-channel contributions in this kinematical region. The asymmetries are found to be positive, which can be explained by rho exchange in the t channel. Large positive asymmetries in the small-vertical bar t vertical bar region, where the rho-exchange contribution becomes small, could be explained by introducing p-exchange interference with the s channel. |
电子版国际标准刊号 | 2469-9993 |
WOS关键词 | LINEARLY POLARIZED PHOTONS ; CHARGED-PION-PHOTOPRODUCTION ; MESON PHOTOPRODUCTION ; PI+ PHOTOPRODUCTION ; NEAR-THRESHOLD ; HYDROGEN ; ENERGIES ; SPRING-8 |
WOS研究方向 | Physics |
语种 | 英语 |
WOS记录号 | WOS:000423230200009 |
内容类型 | 期刊论文 |
源URL | [http://ir.ihep.ac.cn/handle/311005/285551] |
专题 | 高能物理研究所_实验物理中心 |
作者单位 | 中国科学院高能物理研究所 |
推荐引用方式 GB/T 7714 | LEPS Collaboration. Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV[J]. PHYSICAL REVIEW C,2018,97(1):15205. |
APA | LEPS Collaboration.(2018).Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV.PHYSICAL REVIEW C,97(1),15205. |
MLA | LEPS Collaboration."Differential cross section and photon-beam asymmetry for the (gamma)over-right-arrow p -> pi(+) n reaction at forward pi(+) angles at E-gamma=1.5-2.95 GeV".PHYSICAL REVIEW C 97.1(2018):15205. |
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